KA4,
Expecting your Association is incorporated, MD corporate law would apply.
Per ยง 2-408. Action by directors:
(a) Majority rule. -- Unless this article or the charter or bylaws of the corporation require a greater proportion, the action of a majority of the directors present at a meeting at which a quorum is present is the action of the board of directors.
Note: it says the action of a majority of
the directors present at a meeting. It does not say a majority of the directors or their proxy. . .
I believe that this statute would be what you are looking for.
Per
Montgomery County Department of Housing and Community Affairs [emphasis added]:
It's not uncommon for a board member to give his or her proxy to another board member to use at board meetings.Few question this practice,
but it is quite often illegal or in violation of the governing documents, and can invalidate a board decision.Your community's attorney can tell you if that practice is legal in your community.